Alert archive / Iowa / Blizzard Watches in 2009

Blizzard Watch 1, NWS Sioux Falls, SD

January 11, 20096 counties in South Dakota; 9 counties in Iowa; 8 counties in Minnesota

NWS Sioux Falls, SD issued this blizzard watch at Jan 11, 2009, 4:33 AM CST for 6 counties in South Dakota; 9 counties in Iowa; 8 counties in Minnesota. It took effect at Jan 12, 2009, 9:00 AM CST. It was in force for .

The area

The counties it named.

The facts

Issued: Jan 11, 2009, 4:33 AM CST (10:33 UTC)
In effect from: Jan 12, 2009, 9:00 AM CST
Expired: Jan 12, 2009, 4:18 AM CST
In force
Issued by: NWS Sioux Falls, SD

All 23 counties

Buena Vista County, IA, Cherokee County, IA, Clay County, IA, Dickinson County, IA, Ida County, IA, Lyon County, IA, O'Brien County, IA, Osceola County, IA, Sioux County, IA, Cottonwood County, MN, Jackson County, MN, Lincoln County, MN, Lyon County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Rock County, MN, Brookings County, SD, Kingsbury County, SD, Lake County, SD, Lincoln County, SD, Minnehaha County, SD, Moody County, SD

The radar

The Sioux Falls radar (KFSD), 58 km from the middle of the area, began a volume at 10:37 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 10.6 hours before the alert went out and 237 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1318 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 71 m²/s²
0-3 km storm-relative helicity: 97 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this blizzard watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Sioux Falls, SD wrote its last area forecast discussion before this blizzard watch went out at Jan 10, 8:30 PM CST, 8 hours 3 minutes earlier.

Area forecast discussion, Jan 10, 8:30 PM CST, 8 hours 3 minutes before

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Hazardous weather outlook, Jan 10, 5:00 AM CST, 23 hours 33 minutes before

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The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jan 11, 2:50 PM CST	Winter Weather Advisory	FSD	Aurora, Beadle, Bon Homme, Brookings, Brule, Charles Mix and 18 more	30 hr
Jan 11, 2:58 PM CST	Wind Advisory	FSD	Aurora, Beadle, Bon Homme, Brule, Charles Mix, Clay and 12 more	21 hr

Nearby

Blizzard Watches in Iowa, 2009 Blizzard Watches in Minnesota, 2009 Blizzard Watches in South Dakota, 2009 Every blizzard watch in 2009

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.